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Glossary 115
node Logically speaking, an environment where instances can be executed.
Physically, a processor, which is an element of a cluster system.
NVS Nonvolatile storage.
OFC Open Fibre Control.
OLM Optical link module.
ORM Online read margin.
OS Operating system.
P/DAS PPRC/dynamic address switching.
PA Physical address.
parity group A parity group is a mode of disk operation and configuration. It is
synonymous with the term “array group.”
partition Dividing a specific physical disk according to the HP-UX kernel or device
driver layer into two or more areas as if there are two or more physical
disks.
path Paths are created by associating a port, a target, and a LUN ID to one or
more LDEVs.
PCI Power control interface or peripheral component interconnect.
PM HP StorageWorks Performance Manager XP software.
port The number of supported ports on an XP disk array is dependent upon the
number of supported I/O slots and the number of ports available per I/O
adapter. The XP family of disk arrays supports SCSI, Fibre Channel (FC/
AL), ESCON, and FICON I/O interfaces.
I/O support can vary with the
selected disk array.
Ports are named based upon their port group and port letter. Examples of
port names include CL1-A through CL1-R and CL2-A through CL2-R
(letters I and O are skipped).
P-P Point-to-point.
PPRC Peer-to-peer remote copy.